Density of a substance is defined as the mass per unit volume. Its SI unit is kgm-3

Density of a substance is defined as the mass per unit volume. Its SI unit is kgm-3
Substance | Melting point(°C) | Boiling point(°C) |
X | -219 | -183 |
Y | 119 | 445 |
Z | -15 | 78 |